Umetsu, Keiichi 梅津敬一

Research Fellow

photo of Umetsu, Keiichi
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Office: ASMAB 1319
Email: keiichi _replace_to_@_ asiaa.sinica.edu.tw
pubLON 3921484/keiichi-umetsu/
ORCID 0000-0002-7196-4822
ADS My Publications from ADS

Research Interests

I am an astrophysicist studying dark matter and nonlinear structure formation, with galaxy clusters as laboratories and gravitational lensing as the methodological foundation of a sustained multi-probe research program. My central scientific goal is to understand the assembly and fundamental nature of dark matter across cosmic time.

I authored the review article "Cluster–Galaxy Weak Lensing" (Umetsu, K. 2020) in The Astronomy and Astrophysics Review, which offers a pedagogical synthesis of the theoretical foundations, methodology, and scientific reach of weak gravitational lensing by galaxy clusters. An updated version incorporating corrected references and other errata is available here: [link].

More recently, I coauthored an advanced graduate textbook in Japanese, “一般相対論の基礎から学ぶ 重力レンズと重力波天文学” ("Gravitational Lensing and Gravitational Wave Astronomy from the Foundations of General Relativity"; Nippon Hyoron Sha Co., Ltd., 2025). I authored Chapter 3 on gravitational lensing, which provides a systematic exposition of its theoretical foundations and cosmological applications.

Positions

Education

Honors & Awards

Journal Papers affiliated with ASIAA(218)

  1. Gavidia A; Kim J; Sayers J; Sereno M; Chappuis L; Eckert D; Umetsu K; Bourdin H; De Luca F; Ettori S; Gaspari M; Gavazzi R; Kay S; Lovisari L; Mazzotta P; Pratt GW; Rasia E; Rossetti M; Saxena H, "CHEX-MATE: Cluster multi-probes in three dimensions (CLUMP-3D): II. Combined gas and dark matter analysis from X-ray, SZE, and WL", A&A: 710, id.A40 (21 pp), May, 2026 [SCI] ( ADS | Fulltext )
  2. Pizzuti L; Rivano F; Umetsu K; Biviano A, "CLASH-VLT: The Fifth Force in Chameleon Gravity from Joint Lensing and Kinematics Cluster Mass Profiles", Universe: 12(5), id.124 ( pp), Apr, 2026 [SCI] ( ADS | Fulltext )
  3. Regamey M; Eckert D; Seppi R; Hartley W; Umetsu K; Tam S; Gerolymatou D, "Galaxy cluster count cosmology with simulation-based inference", A&A: 708, id.A260 (17 pp), Apr, 2026 [SCI] ( ADS | Fulltext )
  4. Pizzuti L; Biviano A; Umetsu K; Agostoni E; Autorino A; Pombo AM; Mercurio A; D'Addona M, "CLASH-VLT: Constraining deviation from GR with the mass profiles of nine massive galaxy clusters", JCAP: 2026(3), id.022 (29 pp), Mar, 2026 [SCI] ( ADS | Fulltext )
  5. Chiu I-N; Ghirardini V; Grandis S; Okabe N; Artis E; Bulbul E; Bahar YE; Balzer F; Clerc N; Comparat J; Hsieh B-C; Kleinebreil F; Kluge M; Liu A; Monteiro-Oliveira R; Oguri M; Pacaud F; Ramos Ceja M; Reiprich HT; Sanders J; Schrabback T; Seppi R; Sommer M; Tam S-I; Umetsu K; Zhang X, "The SRG/eROSITA All-Sky Survey: The weak-lensing mass calibration and the stellar mass-to-halo mass relation from the Hyper Suprime-Cam Subaru Strategic Program", A&A: 704, id.A110 (28 pp), Dec, 2025 [SCI]
  6. Breuer JP; Werner N; Plšek T; Mernier F; Umetsu K; Simionescu A; Devlin M; Di Mascolo L; Dibblee-Barkman T; Dicker S; Mason BS; Mroczkowski T; Romero C; Sarazin CL; Sievers J, "The thermodynamic structure and large-scale structure filament in MACS J0717.5+3745", A&A: 703, id.A.231 (23pp), Nov, 2025 [SCI]
  7. Pozo A; Broadhurst T; Luu HN; Smoot G; Umetsu K; Chiueh T; Schive H-Y; Emami R; Hernquist L; Mocz P; Vogelsberger M, "Infalling ultra-faint dwarfs as emissaries of the Axiverse", A&A: 704, id.A34 (12 pp), Nov, 2025 [SCI]
  8. Roy Choudhury S; Okumura T; Umetsu K, "Cosmological Constraints on Nonphantom Dynamical Dark Energy with DESI Data Release 2 Baryon Acoustic Oscillations: A 3σ+ Lensing Anomaly", ApJL: 994(1), id. L26, Nov, 2025 [SCI]
  9. Umetsu K; Pizzardo M; Diaferio A; Geller MJ, "Cluster Lensing Mass Inversion (CLUMI+): Combining Dynamics and Weak Lensing around Galaxy Clusters", ApJ: 990(1), id.70 (21pp), Sep, 2025 [SCI]
  10. Mondal C; Saha K; Borgohain A; Smith BM; Windhorst RA; Reddy N; Chen C-C; Umetsu K; Jansen RA, "GNHeII J1236+6215: A He II λ1640 Emitting and Potentially LyC Leaking Galaxy at z = 2.9803 Unveiled through JWST and Keck Observations", ApJ: 988(2), id.171 (19 pp), Aug, 2025 [SCI]
  11. Okabe N; Reiprich TH; Grandis S; Chiu I-N; Oguri M; Umetsu K; Bulbul E; Bahar E; Balzer F; Clerc N; Comparat J; Ghirardini V; Kleinebreil F; Kluge M; Liu A; Monteiro-Oliveira R; Pacaud F; Ramos Ceja M; Sanders J; Schrabback T; Seppi R; Sommer M; Zhang X, "The SRG/eROSITA All-Sky Survey : Subaru/HSC-SSP weak-lensing mass measurements for the eRASS1 Galaxy Clusters", A&A: 700, id.A46 (26 pp), Aug, 2025 [SCI]
  12. Chappuis L; Eckert D; Sereno M; Gavidia A; Sayers J; Kim J; Rossetti M; Umetsu K; Saxena H; Bartalucci I; Gavazzi R; Rowlands Doblas A; Pointecouteau E; Ettori S; Pratt GW; Bourdin H; Cassano R; De Luca F; De Petris M; Donahue M; Gaspari M; Gastaldello F; Ghirardini V; Gitti M; Maughan B; Mazzotta P; Oppizzi F; Rasia E; Radovich M, "CHEX-MATE: Multiprobe analysis of Abell 1689", A&A: 699, id.A141 (22 pp), Jul, 2025 [SCI]
  13. Stuardi C; Botteon A; Sereno M; Umetsu K; Gavazzi R; Bonafede A; Gheller C, "Radio emission from a massive node of the cosmic web: A discovery powered by machine learning", A&A: 695, id.L16 (7 pp), Mar, 2025 [SCI]
  14. Fujimoto S; Kohno K; Ouchi M; Oguri M; Kokorev V; Brammer G; Sun F; Gonzalez-Lopez J; Bauer FE; Caminha GB; Hatsukade B; Richard J; Smail I; Tsujita A; Ueda Y; Uematsu R; Zitrin A; Coe D; Kneib J-P; Postman M; Umetsu K; Lagos CDP; Popping G; Ao Y; Bradley L; Caputi K; Dessauges-Zavadsky M; Egami E; Espada D; Ivison RJ; Jauzac M; Knudsen KK; Koekemoer AM; Magdis GE; Mahler G; Munoz Arancibia AM; Rawle T; Shimasaku K; Toft S; Umehata H; Valentino F; Wang T; Wang W-H, "ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z≃1−8", ApJS: 275(2), id.36 (59 pp.), Dec, 2024 [SCI]
  15. Riva G; Pratt GW; Rossetti M; Bartalucci I; Kay ST; Rasia E; Gavazzi R; Umetsu K; Arnaud M; Balboni M; Bonafede A; Bourdin H; De Grandi S; De Luca F; Eckert D; Ettori S; Gaspari M; Gastaldello F; Ghirardini V; Ghizzardi S; Gitti M; Lovisari L; Maughan BJ; Mazzotta P; Molendi S; Pointecouteau E; Sayers J; Sereno M; Towler I, "CHEX-MATE: the intracluster medium entropy distribution in the gravity-dominated regime", A&A: 691, id.A340 (27 pp), Nov, 2024 [SCI]
  16. Fu S; Dell'antonio I; Escalante Z; Nelson J; Englert A; Helhoski S; Shinde R; Brockland J; Laduca P; Larkin C; Paris L; Weiner S; Black WK; Chary R-R; Clowe D; Cooper MC; Donahue M; Evrard A; Lacy M; Lauer T; Liu B; Mccleary J; Meneghetti M; Miyatake H; Montes M; Natarajan P; Ntampaka M; Pierpaoli E; Postman M; Sohn J; Turner D; Umetsu K; Utsumi Y; Wilson G, "LoVoCCS. II. Weak Lensing Mass Distributions, Red-sequence Galaxy Distributions, and Their Alignment with the Brightest Cluster Galaxy in 58 Nearby X-Ray-luminous Galaxy Clusters", ApJ: 974(1), id.69 (31 pp), Oct, 2024 [SCI]
  17. Kim J; Sayers J; Sereno M; Bartalucci I; Chappuis L; De Grandi S; De Luca F; De Petris M; Donahue ME; Eckert D; Ettori S; Gaspari M; Gastaldello F; Gavazzi R; Gavidia A; Ghizzardi S; Iqbal A; Kay ST; Lovisari L; Maughan BJ; Mazzotta P; Okabe N; Pointecouteau E; Pratt GW; Rossetti M; Umetsu K, "CHEX-MATE: CLUster Multi-Probes in Three Dimensions (CLUMP-3D). I. Gas analysis method using X-ray and Sunyaev-Zel'dovich effect data", A&A: 686, id.A97 (15 pp), June, 2024 [SCI]
  18. Diego JM; Li SK; Meena AK; Niemiec A; Acebron A; Jauzac M; Struble MF; Amruth A; Broadhurst TJ; Cerny C; Ebeling H; Filippenko AV; Jullo E; Kelly P; Koekemoer AM; Lagattuta D; Lim J; Limousin M; Mahler G; Patel N; Remolina J; Richard J; Sharon K; Steinhardt C; Umetsu K; Williams L; Zitrin A; Palencia JM; Dai L; Ji L; Pascale M, "BUFFALO/Flashlights: Constraints on the abundance of lensed supergiant stars in the Spock galaxy at redshift 1", A&A: 681, id.A124 (24 pp), Jan, 2024 [SCI]
  19. Jian H-Y; Lin L; Hsieh B-C; Umetsu K; Lopez-Coba C; Oguri M; Bottrell C; Toba Y; Koyama Y; Chang Y-Y; Kodama T; Komiyama Y; More S; Lin K-Y; Nishizawa AJ; Tanaka I, "Radial and Local Density Dependence of Star Formation Properties in Galaxy Clusters from the Hyper Suprime-Cam Survey", ApJ: 957(2), id.85 (14pp), Nov, 2023 [SCI]
  20. Niemiec A; Jauzac M; Eckert D; Lagattuta D; Sharon K; Koekemoer A M; Umetsu K; Acebron A; Diego J M; Harvey D; Jullo E; Kokorev V; Limousin M; Mahler G; Natarajan P; Nonino M; Steinhardt C; Tam S-I; Zitrin A, "Beyond the ultradeep frontier fields and legacy observations (BUFFALO): a high-resolution strong+weak-lensing view of Abell 370", MNRAS: 524(2), 2883-2910, Sep, 2023 [SCI]
  21. Tam S-I; Umetsu K; Robertson A; McCarthy IG, "Testing the Collisionless Nature of Dark Matter with the Radial Acceleration Relation in Galaxy Clusters", ApJ: 953(2), id.169 (19pp), Aug, 2023 [SCI]
  22. Ferreras I; Böhm A; Umetsu K; Sampaio V; De Carvalho RR, "Exploring the stellar populations of backsplash galaxies", MNRAS: 519(4), 4884-4892, Jan, 2023 [SCI]
  23. Umetsu K; Ueda S; Hsieh B-C; Nonino M; Chiu IN; Oguri M; Molnar SM; Koekemoer AM; Tam S-I, "Line-of-sight Elongation and Hydrostatic Mass Bias of the Frontier Fields Galaxy Cluster Abell 370", ApJ: 934(2), id.169, Aug, 2022 [SCI]
  24. Bouchè F; Capozziello S; Salzano V; Umetsu K, "Testing non-local gravity by clusters of galaxies", European Physical Journal C: 82(7), id.652, July, 2022 [SCI]
  25. Fu S; Dell'antonio I; Chary R-R; Clowe D; Cooper MC; Donahue M; Evrard A; Lacy M; Lauer T; Liu B; Mccleary J; Meneghetti M; Miyatake H; Montes M; Natarajan P; Ntampaka M; Pierpaoli E; Postman M; Sohn J; Umetsu K; Utsumi Y; Wilson G, "LoVoCCS. I. Survey Introduction, Data Processing Pipeline, and Early Science Results", ApJ: 933(1), id.84 (40pp), July, 2022 [SCI]
  26. Garrel C; Pierre M; Valageas P; Eckert D; Marulli F; Veropalumbo A; Pacaud F; Clerc N; Sereno M; Umetsu K; Moscardini L; Bhargava S; Adami C; Chiappetti L; Gastaldello F; Koulouridis E; Le Fevre J-P; Plionis M, "The XXL survey. XLVI. Forward cosmological analysis of the C1 cluster sample", A&A: 663, id.A3 (18 pp), July, 2022 [SCI]
  27. Wang W-H; Foucaud S; Hsieh B-C; Jian H-Y; Lin L; Lin Y-T; Coupon J; Hashimoto Y; Ouchi M; Shimasaku K; Ohyama Y; Umetsu K; Wang S-Y; Chang T-C, "MUSUBI (MegaCam Ultra-deep Survey: u*-band Imaging) Data for the COSMOS and SXDS Fields", ApJS: 260(2), id.54 (15 pp), June, 2022 [SCI]
  28. Chiu I-N; Ghirardini V; Liu A; Grandis S; Bulbul E; Bahar YE; Comparat J; Bocquet S; Clerc N; Klein M; Liu T; Li X; Miyatake H; Mohr J; Oguri M; Okabe N; Pacaud F; Ramos-Ceja ME; Reiprich TH; Schrabback T; Umetsu K, "The eROSITA Final Equatorial-Depth Survey (eFEDS). X-ray observable-to-mass-and-redshift relations of galaxy clusters and groups with weak-lensing mass calibration from the Hyper Suprime-Cam Subaru Strategic Program survey", A&A: 661, id.A11 (41pp), May, 2022 [SCI]
  29. Díaz-García LA; Umetsu K; Rasia E; Cui W; Meneghetti M, "The Three Hundred project: dissecting the Fundamental Plane of galaxy clusters up to z = 1", MNRAS: 512(1), 1214-1233, May, 2022 [SCI]
  30. Pizzuti L; Saltas ID; Umetsu K; Sartoris B, "Probing Vainsthein-screening gravity with galaxy clusters using internal kinematics and strong and weak lensing", MNRAS: 512(3), 4280-4290, May, 2022 [SCI]
  31. Hashimoto Y; Böhringer H; Umetsu K, "Dwarf galaxy luminosity functions and cluster environments", MNRAS: 511(2), 2796-2813, April, 2022 [SCI]
  32. Laudato E; Salzano V; Umetsu K, "Multicomponent DHOST analysis in galaxy clusters", MNRAS: 511(2), 1878-1892, April, 2022 [SCI]
  33. Akino D; Eckert D; Okabe N; Sereno M; Umetsu K; Oguri M; Gastaldello F; Chiu IN; Ettori S; Evrard AE; Farahi A; Maughan B; Pierre M; Ricci M; Valtchanov I; Mccarthy I; Mcgee S; Miyazaki S; Nishizawa AJ; Tanaka M, "HSC-XXL: Baryon budget of the 136 XXL groups and clusters", PASJ: 74(1), 175-208, Feb, 2022 [SCI]
  34. Jian H-Y; Lin L; Hsieh B-C; Lin K-Y; Umetsu K; Lopez-Coba C; Koyama Y; Hsu C-H; Su Y-C; Chang Y-Y; Kodama T; Komiyama Y; More S; Nishizawa A J; Oguri M; Tanaka I, "Star Formation Properties of Sloan Digital Sky Survey BOSS Void Galaxies in the Hyper Suprime-Cam Survey", ApJ: 926(2), id.115 (13 pp), Feb, 2022 [SCI]
  35. Tam S-I; Umetsu K; Amara A, "Likelihood-free Forward Modeling for Cluster Weak Lensing and Cosmology", ApJ: 925(2), id.145 (14pp), Feb, 2022 [SCI]
  36. Mercurio A; Rosati P; Biviano A; Annunziatella M; Girardi M; Sartoris B; Nonino M; Brescia M; Riccio G; Grillo C; Balestra I; Caminha GB; De Lucia G; Gobat R; Seitz S; Tozzi P; Scodeggio M; Vanzella E; Angora G; Bergamini P; Borgani S; Demarco R; Meneghetti M; Strazzullo V; Tortorelli L; Umetsu K; Fritz A; Gruen D; Kelson D; Lombardi M; Maier C; Postman M; Rodighiero G; Ziegler B, "CLASH-VLT: Abell S1063. Cluster assembly history and spectroscopic catalogue", A&A: 656, A147 (24pp), Dec, 2021 [SCI]
  37. Ueda S; Umetsu K; Ng FL; Ichinohe Y; Kitayama T; Molnar SM, "Systematic Perturbations of the Thermodynamic Properties in Cool Cores of HIFLUGCS Galaxy Clusters", ApJ: 922(1), id.81 (17pp), Nov, 2021 [SCI]
  38. Amara A; De La Bella L; Birrer S; Bridle S; Cordero J; Favole G; Harrison I; Harry I; Hartley W; Krawczyk C; Lundgren A; Nord B; Nuttall L; Rollins R; Sudek P; Tam S-I; Tessore N; Tolley A; Umetsu K; Williamson A; Wolz L, "SkyPy: A package for modelling the Universe", The Journal of Open Source Software: 6, 3056, Sep, 2021
  39. Bonoli S; Marín-Franch A; Varela J; Vázquez Ramió H; Abramo LR; Cenarro AJ; Dupke RA; Vílchez JM; Cristóbal-Hornillos D; González Delgado RM; Hernández-Monteagudo C; López-Sanjuan C; Muniesa DJ; Civera T; Ederoclite A; Hernán-Caballero A; Marra V; Baqui PO; Cortesi A; Cypriano ES; Daflon S; De Amorim AL; Díaz-García LA; Diego JM; Martínez-Solaeche G; Pérez E; Placco VM; Prada F; Queiroz C; Alcaniz J; Alvarez-Candal A; Cepa J; Maroto AL; Roig F; Siffert BB; Taylor K; Benitez N; Moles M; Sodré L; Carneiro S; Mendes De Oliveira C; Abdalla E; Angulo RE; Aparicio Resco M; Balaguera-Antolínez A; Ballesteros FJ; Brito-Silva D; Broadhurst T; Carrasco ER; Castro T; Cid Fernandes R; Coelho P; De Melo RB; Doubrawa L; Fernandez-Soto A; Ferrari F; Finoguenov A; García-Benito R; Iglesias-Páramo J; Jiménez-Teja Y; Kitaura FS; Laur J; Lopes PaA; Lucatelli G; Martínez VJ; Maturi M; Overzier RA; Pigozzo C; Quartin M; Rodríguez-Martín JE; Salzano V; Tamm A; Tempel E; Umetsu K; Valdivielso L; Von Marttens R; Zitrin A; Díaz-Martín MC; López-Alegre G; López-Sainz A; Yanes-Díaz A; Rueda-Teruel F; Rueda-Teruel S; Abril Ibañez J; L Antón Bravo J; Bello Ferrer R; Bielsa S; Casino JM; Castillo J; Chueca S; Cuesta L; Garzarán Calderaro J; Iglesias-Marzoa R; Ýniguez C; Lamadrid Gutierrez JL; Lopez-Martinez F; Lozano-Pérez D; Maícas Sacristán N; Molina-Ibáñez EL; Moreno-Signes A; Rodríguez Llano S; Royo Navarro M; Tilve Rua V; Andrade U; Alfaro EJ; Akras S; Arnalte-Mur P; Ascaso B; Barbosa CE; Beltrán Jiménez J; Benetti M; Bengaly CaP; Bernui A; Blanco-Pillado JJ; Borges Fernandes M; Bregman JN; Bruzual G; Calderone G; Carvano JM; Casarini L; Chaves-Montero J; Chies-Santos AL; Coutinho De Carvalho G; Dimauro P; Duarte Puertas S; Figueruelo D; González-Serrano JI; Guerrero MA; Gurung-López S; Herranz D; Huertas-Company M; Irwin JA; Izquierdo-Villalba D; Kanaan A; Kehrig C; Kirkpatrick CC; Lim J; Lopes AR; Lopes De Oliveira R; Marcos-Caballero A; Martínez-Delgado D; Martínez-González E; Martínez-Somonte G; Oliveira N; Orsi AA; Penna-Lima M; Reis RRR; Spinoso D; Tsujikawa S; Vielva P; Vitorelli AZ; Xia JQ; Yuan HB; Arroyo-Polonio A; Dantas MLL; Galarza CA; Gonçalves DR; Gonçalves RS; Gonzalez JE; Gonzalez AH; Greisel N; Jiménez-Esteban F; Landim RG; Lazzaro D; Magris G; Monteiro-Oliveira R; Pereira CB; Rebouças MJ; Rodriguez-Espinosa JM; Santos Da Costa S; Telles E, "The miniJPAS survey: A preview of the Universe in 56 colors", A&A: 653, id.A31 (37 pp), Sep, 2021 [SCI]
  40. Sayers J; Sereno M; Ettori S; Rasia E; Cui W; Golwala S; Umetsu K; Yepes G, "CLUMP-3D: the lack of non-thermal motions in galaxy cluster cores", MNRAS: 505(3), 4338-4344, Aug, 2021 [SCI]
  41. CHEX-MATE Collaboration; Arnaud M; Ettori S; Pratt GW; Rossetti M; Eckert D; Gastaldello F; Gavazzi R; Kay ST; Lovisari L; Maughan BJ; Pointecouteau E; Sereno M; Bartalucci I; Bonafede A; Bourdin H; Cassano R; Duffy RT; Iqbal A; Maurogordato S; Rasia E; Sayers J; Andrade-Santos F; Aussel H; Barnes DJ; Barrena R; Borgani S; Burkutean S; Clerc N; Corasaniti P-S; Cuillandre J-C; De Grandi S; De Petris M; Dolag K; Donahue M; Ferragamo A; Gaspari M; Ghizzardi S; Gitti M; Haines CP; Jauzac M; Johnston-Hollitt M; Jones C; Kéruzoré F; LeBrun AMC; Mayet F; Mazzotta P; Melin J-B; Molendi S; Nonino M; Okabe N; Paltani S; Perotto L; Pires S; Radovich M; Rubino-Martin J-A; Salvati L; Saro A; Sartoris B; Schellenberger G; Streblyanska A; Tarrío P; Tozzi P; Umetsu K; van der Burg RFJ; Vazza F; Venturi T; Yepes G; Zarattini S, "The Cluster HEritage project with XMM-Newton: Mass Assembly and Thermodynamics at the Endpoint of structure formation. I. Programme overview", A&A: 650, A104 (25pp), Jun, 2021 [SCI]
  42. Willis JP; Oguri M; Ramos-Ceja ME; Gastaldello F; Sereno M; Adami C; Alis S; Altieri B; Chiappetti L; Corasaniti PS; Eckert D; Ettori S; Garrel C; Giles P; Lefevre J; Faccioli L; Fotopoulou S; Hamabata A; Koulouridis E; Lieu M; Lin YT; Maughan B; Nishizawa AJ; Okabe T; Okabe N; Pacaud F; Paltani S; Pierre M; Plionis M; Poggianti B; Pompei E; Sadibekova T; Umetsu K; Valageas P, "Understanding X-ray and optical selection of galaxy clusters: a comparison of the XXL and CAMIRA cluster catalogues obtained in the common XXL-HSC SSP area", MNRAS: 503(4), 5624-5637, June, 2021 [SCI]
  43. Strait V; Bradač M; Coe D; Lemaux BC; Carnall AC; Bradley L; Pelliccia D; Sharon K; Zitrin A; Acebron A; Neufeld C; Andrade-Santos F; Avila RJ; Frye BL; Mahler G; Nonino M; Ogaz S; Oguri M; Ouchi M; Paterno-Mahler R; Stark DP; Mainali R; Oesch PA; Trenti M; Carrasco D; Dawson WA; Jones C; Umetsu K; Vulcani B, "RELICS: Properties of z ≥ 5.5 Galaxies Inferred from Spitzer and Hubble Imaging, Including A Candidate z ∼ 6.8 Strong [O III] emitter", ApJ: 910(2), id.135 (20pp), Apr, 2021 [SCI]
  44. Okabe N; Dicker S; Eckert D; Mroczkowski T; Gastaldello F; Lin Y-T; Devlin M; Romero CE; Birkinshaw M; Sarazin C; Horellou C; Kitayama T; Umetsu K; Sereno M; Mason BS; Zuhone JA; Honda A; Akamatsu H; Chiu IN; Kohno K; Lin K-Y; Medezinski E; Miyazaki S; Mitsuishi I; Nishizawa AJ; Oguri M; Ota N; Pacaud F; Pierre M; Sievers J; Smolčić V; Stanchfield S; Tanaka K; Yamamoto R; Yang C; Yoshida A, "Active gas features in three HSC-SSP CAMIRA clusters revealed by high angular resolution analysis of MUSTANG-2 SZE and XXL X-ray observations", MNRAS: 501(2), 1701-1732, Feb, 2021 [SCI]
  45. Umetsu K, "Cluster-Galaxy Weak Lensing", A&ARv: 28(1), id.7 (101pp.), Dec, 2020 [SCI]
  46. Chiu I-N; Okumura T; Oguri M; Agrawal A, ...; Umetsu K; Lin Y-T, "A clustering-based self-calibration of the richness-to-mass relation of CAMIRA galaxy clusters out to z ≍ 1.1 in the Hyper Suprime-Cam survey", MNRAS: 498(2), 2030-2053, Oct, 2020 [SCI]
  47. Ricci M; Adam R; Eckert D; ...; Umetsu K, "The XXL Survey. XLIV. Sunyaev-Zel'dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach", A&A: 642, A126 (20pp.), Oct, 2020 [SCI]
  48. Trudeau A; Garrel C; Willis J; ...; Umetsu K; et al., "The XXL Survey. XLII. Detection and characterisation of the galaxy population of distant galaxy clusters in the XXL-N/VIDEO field: A tale of variety", A&A: 642, id.A124 (25pp.), Oct, 2020 [SCI]
  49. Molnar SM; Ueda S; Umetsu K; et al., "The Dynamical State of the Frontier Fields Galaxy Cluster Abell 370", ApJ: 900(2), id.151 (10pp.), Sep, 2020 [SCI]
  50. Acebron A; Zitrin A; Coe D; ...; Umetsu K; ...; Czakon NG; et al., "RELICS: A Very Large (θE ∼ 40″) Cluster Lens—RXC J0032.1+1808", ApJ: 898(1), id.6 (23pp.), July, 2020 [SCI]
  51. Tian Y; Umetsu K; Ko C-M; ...; Chiu I-N, "The Radial Acceleration Relation in CLASH Galaxy Clusters", ApJ: 896(1), id.70 (10 pp.), Jun, 2020 [SCI]
  52. Jian H-Y; Lin L; Koyama Y; ...Umetsu K; Hsieh B-C; Higuchi Y; ...; Chang YY, "Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey", ApJ: 894(2), id.125 (18pp.), May, 2020 [SCI]
  53. Sartoris B; Biviano A; Rosati P; ...; Umetsu K; et al., "CLASH-VLT: a full dynamical reconstruction of the mass profile of Abell S1063 from 1 kpc out to the virial radius", A&A: 637, id.A34 (11pp.), May, 2020 [SCI]
  54. Chiu IN; Umetsu K; Murata R; et al., "The Richness-to-Mass Relation of CAMIRA Galaxy Clusters from Weak-lensing Magnification in the Subaru Hyper Suprime-Cam Survey", MNRAS: 495(1), 428-450, Apr, 2020 [SCI]
  55. Steinhardt CL; Jauzac M; Acebron A; ...; Umetsu K; et al., "The BUFFALO HST Survey", ApJS: 247(2), id.64 (20 pp.), Apr, 2020 [SCI]
  56. Ueda S; Ichinohe Y; Molnar SM; Umetsu K; et al., "Gas Density Perturbations in the Cool Cores of CLASH Galaxy Clusters", ApJ: 892(2), id.100 (20pp.), Apr, 2020 [SCI]
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  173. Zitrin A; Broaodhurst T; ...; Umetsu K, "Strong-Lensing Analysis of MS 1358.4+6245: New Multiple Images and Implications for the Well-Resolved z=4.92 Galaxy", MNRAS: 413(3), 1753-1763, May, 2011 [SCI]
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  186. Umetsu K; ...; Okabe N; Hsieh BC; Molnar SM, "The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations", ApJ: 714(2), 1470-1496, May 10, 2010 [SCI]
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  192. Ho PTP; Altamirano P; Chang C-H; Chang S-H; Chang S-W; Chen C-C; Chen K-J; Chen M-T; Han C-C; Ho WM; Huang Y-D; Hwang Y-J; Ibañez-Romano F; Jiang H; Koch PM; Kubo DY; Li C-T; Lim J; Lin K-Y; Liu G-C; Lo K-Y; Ma C-J; Martin RN; Martin-Cocher P; Molnar SM; Ng K-W; Nishioka H; O'Connell KE; Oshiro P; Patt F; Raffin P; Umetsu K; Wei T; et al., "The Yuan-Tseh Lee Array for Microwave Background Anisotropy", ApJ: 694(2), 1610-1618, April 1, 2009 [SCI]
  193. Koch PM; Kesteven M; Nishioka H; Jiang H; Lin K-Y; Umetsu K; Huang Y-D; Raffin P; Chen K-J; Ibañez-Romano F; Chereau G; Huang C-WL; Chen M-T; Ho PTP; Pausch K; Willmeroth K; Altamirano P; Chang C-H; Chang S-H; Chang S-W; Han C-C; Kubo D; Li C-T; Liao Y-W; Liu G-C; Martin-Cocher P; Oshiro P; Wang F-C; Wei T-S; Wu J-HP; Birkinshaw M; Chiueh T; Lancaster K; Lo KY; Martin RN; Molnar SM; et al., "The AMiBA Hexapod Telescope Mount", ApJ: 694(2), 1670-1684, April 1, 2009 [SCI]
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  195. Nishioka H; Wang F-C; Wu J-HP; Ho PTP; Huang C-WL; Koch PM; Liao Y-W; Lin K-Y; Liu G-C; Molnar SM; Umetsu K; Birkinshaw M; Altamirano P; Chang C-H; Chang S-H; Chang S-W; Chen M-T; Han C-C; Huang Y-D; Hwang Y-J; Jiang H; Kesteven M; Kubo DY; Li C-T; Martin-Cocher P; Oshiro P; Raffin P; Wei T; Wilson W, "Tests of AMiBA Data Integrity", ApJ: 694(2), 1637-1642, Apr 1, 2009 [SCI]
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  197. Wu JHP; Ho PTP; ...; Koch PM; ...; Lin KY; Liu GC; Molnar SM; Nishioka H; Umetsu K; ...; Altamirano P; ...; Chang CH; Chang SH; Chang SW; Chen MT; ...; Han CC; Huang YD; Hwang YJ; Jiang HM; ...; Kubo DY; ...; Li CT; Martin-Cocher P; Oshiro P; Raffin P; Wei TS; et al., "Array for Microwave Background Anisotropy: Observations, Data Analysis, and Results for Sunyaev-Zel'Dovich Effects", ApJ: 694(2), 1619-1628, Apr 1, 2009 [SCI]
  198. Broadhurst T; Umetsu K; Medezinski E; Oguri M; et al., "Comparison of Cluster Lensing Profiles with Lambda CDM Predictions", ApJ: 685(1), L9-L12, Sep 2008, 2008 [SCI]
  199. Umetsu K; Broadhurst T, "Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689", ApJ: 684(1), 177-203, Sept, 2008 [SCI]
  200. Ho PTP; Altimirano P; Birkinshaw M; Chang SW; Chang CH; Chen KJ; Chen M; Chiueh TD; Chiueh T; Chu TH; Han CC; Huang CW; Huang YD; Hwang WYP; Hwang YJ; Jiang H; Kesteven M; Koch P; Kubo D; Lancaster K; Li CT; Liang H; Liao YW; Lim J; Lin YS; Lin KY; Liu GC; Lo KY; Ma CJ; Martin-Cocher P; Martin RN; Molnar S; Ng KW; Nishioka H; Park CG; Patt F; Peterson JB; Raffin P; Romano F; Wang H; Umetsu K; Wang FC; Wu JHP, "The Yuan Tseh Lee AMiBA Project", MPLA: 23(20), 1243-1251, June, 2008 [SCI]
  201. Okura Y; Umetsu K; Futamase T, "A Method for Weak Lensing Flexion Analysis by the HOLICs Moment Approach", ApJ: 680(1), 1-16, June 10, 2008 [SCI]
  202. Umetsu K; Okura Y; Futamase T, "A Moment Method for Measuring the Higher-Order Weak Gravitational Lensing Effects", MPLA: 23(17-20), 1506-1513, June, 2008 [SCI]
  203. Wu J-HP; Chiueh T-H; Huang C-W; Liao Y-W; Wang F-C; Altimirano P; Chang C-H; Chang S-H; Chang S-W; Chen M-T; Chereau G; Han C-C; Ho PTP; Huang Y-D; Hwang Y-J; Jiang H; Koch P; Kubo D; Li C-T; Lin K-Y; Liu G-C; Martin-Cocher P; Molnar S; Nishioka H; Raffin P; Umetsu K; et al., "AMiBA: First-Year Results for Sunyaev-Zel'dovich Effect", MPLA: 23(17-20), 1675-1686, June, 2008 [SCI]
  204. Okabe N; Umetsu K, "Subaru Weak Lensing Study of Seven Merging Clusters of Galaxies: Distributions of Mass and Baryon", PASJ: 60(2), 345-375, April 25, 2008 [SCI]
  205. Medezinski E.; Broadhurst T.; Umetsu K.; Coe D., "Using Weak-Lensing Dilutuion to Measure Light Properties of A1689", MPLA: 23(17-20), 1521-1528, 2008 [SCI]
  206. Umetsu K; Takada M; Broadhurst T, "Probing the Cluster Mass Distribution using Subaru Weak Lensing Data", MPLA: 22(25-28), 2099-2106, Sept 14, 2007 [SCI]
  207. Medezinski E; Broadhurst T; Umetsu K; et al., "Using Weak Lensing Dilution to Improve Measurements of the Luminous and Dark Matter in A1689", ApJ: 663(2), 717-733, July 10, 2007 [SCI]
  208. Okura Y; Umetsu K; Futamase T, "A New Measure for Weak Lensing Flexion", ApJ: 660(2), 995-1002, May 10, 2007 [SCI]
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  210. Oguri M; Takada M; Umetsu K; Broadhurst T, "Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?", ApJ: 632(2), 841-847, Oct 20, 2005 [SCI]
  211. Tanaka M; Kodama T; ...; Umetsu K; et al., "The build-up of the colour-magnitude relation as a function of environment", MNRAS: 362(1), 268-288, Sept 2005, 2005 [SCI]
  212. Umetsu K; Broadhurst T; Takada M; Kong X, "The Mass Profile of Abell 1689 from a Lensing Analysis of Deep Wide Field SUBARU Images", JKAS: 38, 191-195, June, 2005
  213. Kodama T; Tanaka M; ...; Kawasaki W; ...; Umetsu K; et al, "Panoramic views of cluster-scaleassemblies explored by subaru wide-field Imaging", PASJ: 57(2), 309-323, Apr, 2005 [SCI]
  214. Broadhurst T; Takada M; Umetsu K; et al., "The Surprisingly Steep Mass Profile of A1689, from a Lensing Analysis of Subaru Images", ApJ: 619(2), L143-L146, Feb 1, 2005 [SCI]
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  216. Umetsu K; Chiueh T; Lin K-Y; Wu J-M; Tseng Y-H, "Simulation of a Combined SZE and Weak Lensing Cluster Survey for AMiBA Experiment", MPLA: 19(13-16), 1027-1030, May 30, 2004 [SCI]
  217. Park CG; Ng KW; ...; Liu GC; Umetsu K, "Observational Strategies of Cosmic Microwave Background Temperature and Polarization Interferometry Experiments", ApJ: 589(1), 67-81, May 20, 2003 [SCI]
  218. Sato J; Umetsu K; Futamase T; Yamada T, "The Topology of a Weak Lensing Field in the Neighborhood of MS 1054-03", ApJ: 582(2), L67-L70, Jan 10, 2003 [SCI]